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review.trustedfirmware.org / hafnium / third_party / linux.git / 0f672f6c0b52b7b0700b0915c72b540721af4465 / . / arch / x86 / include / asm / kprobes.h
blob: 5dc909d9ad8174a4c3dca267903679a4e60eeb0b [file] [log] [blame]
David Brazdil0f672f62019-12-10 10:32:29 +0000[diff] [blame^]1/* SPDX-License-Identifier: GPL-2.0-or-later */
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]2#ifndef _ASM_X86_KPROBES_H
3#define _ASM_X86_KPROBES_H
4/*
5 * Kernel Probes (KProbes)
6 *
Andrew Scullb4b6d4a2019-01-02 15:54:55 +0000[diff] [blame]7 * Copyright (C) IBM Corporation, 2002, 2004
8 *
9 * See arch/x86/kernel/kprobes.c for x86 kprobes history.
10 */
11
12#include <asm-generic/kprobes.h>
13
14#define BREAKPOINT_INSTRUCTION 0xcc
15
16#ifdef CONFIG_KPROBES
17#include <linux/types.h>
18#include <linux/ptrace.h>
19#include <linux/percpu.h>
20#include <asm/insn.h>
21
22#define __ARCH_WANT_KPROBES_INSN_SLOT
23
24struct pt_regs;
25struct kprobe;
26
27typedef u8 kprobe_opcode_t;
28#define RELATIVEJUMP_OPCODE 0xe9
29#define RELATIVEJUMP_SIZE 5
30#define RELATIVECALL_OPCODE 0xe8
31#define RELATIVE_ADDR_SIZE 4
32#define MAX_STACK_SIZE 64
33#define CUR_STACK_SIZE(ADDR) \
34 (current_top_of_stack() - (unsigned long)(ADDR))
35#define MIN_STACK_SIZE(ADDR) \
36 (MAX_STACK_SIZE < CUR_STACK_SIZE(ADDR) ? \
37 MAX_STACK_SIZE : CUR_STACK_SIZE(ADDR))
38
39#define flush_insn_slot(p) do { } while (0)
40
41/* optinsn template addresses */
42extern __visible kprobe_opcode_t optprobe_template_entry[];
43extern __visible kprobe_opcode_t optprobe_template_val[];
44extern __visible kprobe_opcode_t optprobe_template_call[];
45extern __visible kprobe_opcode_t optprobe_template_end[];
46#define MAX_OPTIMIZED_LENGTH (MAX_INSN_SIZE + RELATIVE_ADDR_SIZE)
47#define MAX_OPTINSN_SIZE \
48 (((unsigned long)optprobe_template_end - \
49 (unsigned long)optprobe_template_entry) + \
50 MAX_OPTIMIZED_LENGTH + RELATIVEJUMP_SIZE)
51
52extern const int kretprobe_blacklist_size;
53
54void arch_remove_kprobe(struct kprobe *p);
55asmlinkage void kretprobe_trampoline(void);
56
57extern void arch_kprobe_override_function(struct pt_regs *regs);
58
59/* Architecture specific copy of original instruction*/
60struct arch_specific_insn {
61 /* copy of the original instruction */
62 kprobe_opcode_t *insn;
63 /*
64 * boostable = false: This instruction type is not boostable.
65 * boostable = true: This instruction has been boosted: we have
66 * added a relative jump after the instruction copy in insn,
67 * so no single-step and fixup are needed (unless there's
68 * a post_handler).
69 */
70 bool boostable;
71 bool if_modifier;
72};
73
74struct arch_optimized_insn {
75 /* copy of the original instructions */
76 kprobe_opcode_t copied_insn[RELATIVE_ADDR_SIZE];
77 /* detour code buffer */
78 kprobe_opcode_t *insn;
79 /* the size of instructions copied to detour code buffer */
80 size_t size;
81};
82
83/* Return true (!0) if optinsn is prepared for optimization. */
84static inline int arch_prepared_optinsn(struct arch_optimized_insn *optinsn)
85{
86 return optinsn->size;
87}
88
89struct prev_kprobe {
90 struct kprobe *kp;
91 unsigned long status;
92 unsigned long old_flags;
93 unsigned long saved_flags;
94};
95
96/* per-cpu kprobe control block */
97struct kprobe_ctlblk {
98 unsigned long kprobe_status;
99 unsigned long kprobe_old_flags;
100 unsigned long kprobe_saved_flags;
101 struct prev_kprobe prev_kprobe;
102};
103
104extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
105extern int kprobe_exceptions_notify(struct notifier_block *self,
106 unsigned long val, void *data);
107extern int kprobe_int3_handler(struct pt_regs *regs);
108extern int kprobe_debug_handler(struct pt_regs *regs);
109
110#endif /* CONFIG_KPROBES */
111#endif /* _ASM_X86_KPROBES_H */